package com.zhangtai.utils;

import org.apache.commons.codec.binary.Base64;
import sun.misc.BASE64Decoder;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;
import java.math.BigInteger;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class AESUtil {
    //密钥 (需要前端和后端保持一致)

    private static final String KEY = "N!KsTS3R^rwY&bQ7@c*O&&";
    //算法
    private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";

    private static final String DONGRUAN_KEY = "rort*94MttHat!1@";





    /**
     * 东软接口aes加密
     * @return
     * @throws Exception
     */
    public static String encoeDongruan() {
        try {
            String content = "talentbase_"+new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
            return aesEncrypt(content, DONGRUAN_KEY);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * aes解密
     * @param content   内容
     * @return
     * @throws Exception
     */
    public static String decodeDongruan(String content) {

        try {
            return aesDecrypt(content, DONGRUAN_KEY);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }


    /**
     * aes解密
     * @param encrypt   内容
     * @return
     * @throws Exception
     */
    public static String aesDecrypt(String encrypt) {
        String l = System.currentTimeMillis()+"";
        String substring = l.substring(0, 6)+"0000";

        try {
            return aesDecrypt(encrypt, KEY+substring);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /**
     * H5aes解密
     * @param encrypt   内容
     * @return
     * @throws Exception
     */
    public static String aesDecryptH5(String encrypt) {
        Calendar cal = Calendar.getInstance();
        String key = cal.get(Calendar.YEAR)+"000000000000";


        try {
            return aesDecryptMy(encrypt, key);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    /** 
     * aes加密 
     * @param content 
     * @return 
     * @throws Exception 
     */  
    public static String aesEncrypt(String content) {
        String l = System.currentTimeMillis()+"";
        String substring = l.substring(0, 7)+"000";
        try {
            return aesEncrypt(content, KEY+substring);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }  
    }  
  
    /** 
     * 将byte[]转为各种进制的字符串 
     * @param bytes byte[] 
     * @param radix 可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制 
     * @return 转换后的字符串 
     */  
    public static String binary(byte[] bytes, int radix){  
        return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
    }  
  
    /** 
     * base 64 encode 
     * @param bytes 待编码的byte[] 
     * @return 编码后的base 64 code 
     */  
    public static String base64Encode(byte[] bytes){  
        return Base64.encodeBase64String(bytes);
    }  
  
    /** 
     * base 64 decode 
     * @param base64Code 待解码的base 64 code 
     * @return 解码后的byte[] 
     * @throws Exception 
     */  
    public static byte[] base64Decode(String base64Code) throws Exception{  
        return StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
    }  
  
      
    /** 
     * AES加密 
     * @param content 待加密的内容 
     * @param encryptKey 加密密钥 
     * @return 加密后的byte[] 
     * @throws Exception 
     */  
    public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {  
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);  
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "AES"));
  
        return cipher.doFinal(content.getBytes("utf-8"));  
    }  
  
  
    /** 
     * AES加密为base 64 code 
     * @param content 待加密的内容 
     * @param encryptKey 加密密钥 
     * @return 加密后的base 64 code 
     * @throws Exception 
     */  
    public static String aesEncrypt(String content, String encryptKey) throws Exception {  
        return base64Encode(aesEncryptToBytes(content, encryptKey));  
    }  
  
    /** 
     * AES解密 
     * @param encryptBytes 待解密的byte[] 
     * @param decryptKey 解密密钥 
     * @return 解密后的String 
     * @throws Exception 
     */  
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {  
        KeyGenerator kgen = KeyGenerator.getInstance("AES");  
        kgen.init(128);  
  
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);

        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
        byte[] decryptBytes = cipher.doFinal(encryptBytes);  
        return new String(decryptBytes);  
    }  
  
  
    /** 
     * 将base 64 code AES解密 
     * @param encryptStr 待解密的base 64 code 
     * @param decryptKey 解密密钥 
     * @return 解密后的string 
     * @throws Exception 
     */  
    public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
        return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);  
    }

    /**
     * 将base 64 code AES解密
     * @param encryptStr 待解密的base 64 code
     * @param decryptKey 解密密钥
     * @return 解密后的string
     * @throws Exception
     */
    public static String aesDecryptMy(String encryptStr, String decryptKey) throws Exception {
        byte[] ret = base64Decode(encryptStr);
        String decrypt =  new String(ret,"UTF-8");
        return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
    }

    /**
     * 测试
     */
    public static void main(String[] args) throws Exception {
        String s = AESUtil.encoeDongruan();
        System.out.println(s);
    } 
}